Support code tips

[nooogle]

Tip: all the VS2019 icons can be downloaded from: https://www.microsoft.com/en-us/download/details.aspx?id=35825

Tried adding this, so far by setting the Editor.ContextActionsIcon to the VS2019 lightbulb, but the menus that appear aren't the same as in VS2019 or Roslynpad.

Need to see how Roslynpad does ths. (https://github.com/aelij/RoslynPad)

Example of something that code tips should help with:

private int z;
public int Z
{
    get { return z; }
    set { z = value;}
}

Code tip should suggest and then perform auto-property:

public int Z { get; set; }

[nooogle]

The bulb help was really inconsistent in V1.0.13 and was commented out. Great to bring it back and make it work, along with the correct code actions support (see issue #26).